The arrival of the Q2D regime in the spheroid wake is also accompanied by distinctive features of the Q2D regime reported in previous literature. Figure REF (d) shows lateral meanders in the late \(\mbox{\textit {Fr}}= 2\)  wake similar to the lateral meanders in temporal simulations in the literature [1]}, [2]}, albeit the temporal-simulation meanders occur much later in \(Nt\)  units. As noted during the discussion of spectra, the waviness in the late wake has a characteristic frequency \(\mbox{\textit {St}}\approx 0.35\) . The mean wake in the Q2D regime has a layered topology (figure REF f) as reported by [3]} and [4]}. The turbulence state in the Q2D regime is characterized by weak vertical fluctuations \(u_z^{\prime } << u^{\prime }_h\)  [5]} with \(\lbrace E_{Kz}^{T}\rbrace /\lbrace E_{Kh}^{T}\rbrace  < 0.1\)  at \(x > 60\)  – where subscript \(h\)  denotes the horizontal component of the fluctuations. Since the Q2D regime of the spheroid wake is in a relatively early phase, pancake vortices do not appear until the end of the simulation domain, \( x = 80\) .
